Whats this?

[Lowsdime]

Looking to figure out what these couple different things are that I've recently noticed popping up let me know if you guys have any clues

 

[HN1]

Aiptasia
sponges?
I see a macro starting, coralline, tubeworm tubes?
Xenia

I think...

 

[Lowsdime]

Are any of them bad??

 

[kay-bee19]

The aiptasia is considered a pest (they can sting other corals and multipy in number and spread).

 

[HN1]

#1 can be.

Aiptasia

 

[the_fish_man]

Aiptasia
sponges?
I see a macro starting, coralline, tubeworm tubes?
Xenia

I think...

I agree with all of this.

 

[Lowsdime]

Hmm ok there is also some white ones that look similar, same stuff?? Which one is the tube worm